"Boil and card" Rust Removal

In this vid I try the boil and card rust removal method on a rusty Enfield grenade launcher cup from Century Arms
Credit to Mark Novak for introducing me to this method
Items used:
Cheap wal mart stainless pot
Brownells carding wheel and brush
Harbor Freight corded drill
Ballistol
Amazon acid brush
Wal Mart condiment container
Thin hardware store wire